This filter was found in an American publication from the 1980s. The circuit can be implemented with any operational amplifier. The power supply must be symmetrical.
This interesting circuit was obtained from a Poptronics of February 2001. The American magazine no...
This circuit is from a 1968 publication by General Electric. The circuit can be applied to any...
Some old analog multimeters use a 22.5 V battery for high resistance measures. These batteries can no...